ListView adapter中的Data也要在主线程更改否则报错如下:

04-09 15:38:04.461: W/System.err(5063): java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(2131231197, class android.widget.ListView) with Adapter(class android.widget.HeaderViewListAdapter)]
04-09 15:38:04.469: W/System.err(5063): at android.widget.ListView.layoutChildren(ListView.java:1495)
04-09 15:38:04.469: W/System.err(5063): at android.widget.AbsListView.onLayout(AbsListView.java:1147)
04-09 15:38:04.469: W/System.err(5063): at android.view.View.layout(View.java:7089)
04-09 15:38:04.469: W/System.err(5063): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1315)
04-09 15:38:04.469: W/System.err(5063): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1154)
04-09 15:38:04.469: W/System.err(5063): at android.widget.LinearLayout.onLayout(LinearLayout.java:1071)
04-09 15:38:04.469: W/System.err(5063): at android.view.View.layout(View.java:7089)
04-09 15:38:04.469: W/System.err(5063): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
04-09 15:38:04.469: W/System.err(5063): at android.view.View.layout(View.java:7089)
04-09 15:38:04.469: W/System.err(5063): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
04-09 15:38:04.469: W/System.err(5063): at android.view.View.layout(View.java:7089)
04-09 15:38:04.469: W/System.err(5063): at android.view.ViewRoot.performTraversals(ViewRoot.java:1070)
04-09 15:38:04.469: W/System.err(5063): at android.view.ViewRoot.handleMessage(ViewRoot.java:1759)
04-09 15:38:04.469: W/System.err(5063): at android.os.Handler.dispatchMessage(Handler.java:99)
04-09 15:38:04.469: W/System.err(5063): at android.os.Looper.loop(Looper.java:123)
04-09 15:38:04.469: W/System.err(5063): at android.app.ActivityThread.main(ActivityThread.java:4668)
04-09 15:38:04.469: W/System.err(5063): at java.lang.reflect.Method.invokeNative(Native Method)
04-09 15:38:04.469: W/System.err(5063): at java.lang.reflect.Method.invoke(Method.java:521)
04-09 15:38:04.469: W/System.err(5063): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
04-09 15:38:04.469: W/System.err(5063): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
package com.example.coursemanager.activities; import android.content.Intent; import android.os.Build; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import com.example.coursemanager.R; import com.example.coursemanager.models.Course; import com.example.coursemanager.services.CourseReminderService; import com.example.coursemanager.utils.CourseDbHelper; import com.google.android.material.appbar.MaterialToolbar; import com.google.android.material.floatingactionbutton.FloatingActionButton; import java.util.List; public class MainActivity extends AppCompatActivity { private static final int ADD_COURSE_REQUEST = 1; private static final int REQUEST_CALENDAR_VIEW = 2; private CourseDbHelper dbHelper; private ListView listView; private ArrayAdapter<Course> adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); startReminderService(); // 初始化数据库 dbHelper = new CourseDbHelper(this); // 初始化Material工具栏 MaterialToolbar toolbar = findViewById(R.id.toolbar); setSupportActionBar(toolbar); // 初始化ListView和自定义Adapter listView = findViewById(R.id.course_list); adapter = new ArrayAdapter<Course>(this, R.layout.item_course, R.id.course_name) { @NonNull @Override public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) { View view = super.getView(position, convertView, parent); Course course = getItem(position); // 绑定视图数据 TextView timeView = view.findViewById(R.id.course_time); TextView teacherView = view.findViewById(R.id.course_teacher); timeView.setText(formatCourseTime(course));// 设置课程时间 teacherView.setText(course.getTeacher());// 设置教师名称 return view; } // 格式化课程时间显示 private String formatCourseTime(Course course) { return String.format("%s %02d:%02d-%02d:%02d", getDayName(course.getDay()), course.getStartTime() / 60,// 开始小时 course.getStartTime() % 60,// 开始分钟 course.getEndTime() / 60, course.getEndTime() % 60); } // 获取星期名称 private String getDayName(int day) { String[] days = {"周一", "周二", "周三", "周四", "周五", "周六", "周日"}; return (day >= 1 && day <= 7) ? days[day - 1] : "未知"; } }; listView.setAdapter(adapter);// 设置适配器 // 设置悬浮按钮点击事件 FloatingActionButton addButton = findViewById(R.id.add_button); addButton.setOnClickListener(v -> { Intent intent = new Intent(MainActivity.this, AddCourseActivity.class); startActivityForResult(intent, ADD_COURSE_REQUEST); }); // 设置列表项点击事件 listView.setOnItemClickListener((parent, view, position, id) -> { Course course = (Course) parent.getItemAtPosition(position); Intent intent = new Intent(MainActivity.this, CourseDetailActivity.class); intent.putExtra("course_id", course.getId()); startActivity(intent); }); // 首次加载数据 refreshCourseList(); } // 刷新课程列表 private void refreshCourseList() { List<Course> courses = dbHelper.getAllCourses();// 从数据库获取所有课程 Log.d("MainActivity", "加载到 " + courses.size() + " 条课程数据"); adapter.clear(); // 清空适配器 adapter.addAll(courses);// 添加新数据 } @Override public boolean onCreateOptionsMenu(Menu menu) { // 加载菜单布局 getMenuInflater().inflate(R.menu.main_menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_calendar) { // 切换到日历视图 Intent intent = new Intent(this, CalendarActivity.class); startActivityForResult(intent, REQUEST_CALENDAR_VIEW); return true; } else if (id == R.id.action_settings) { // 设置按钮点击事件 Toast.makeText(this, "设置功能开发中", Toast.LENGTH_SHORT).show(); return true; } return super.onOptionsItemSelected(item); } @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); // 处理从添加课程界面返回的结果 if (requestCode == ADD_COURSE_REQUEST && resultCode == RESULT_OK) { refreshCourseList(); } // 从日历视图返回时也刷新数据 else if (requestCode == REQUEST_CALENDAR_VIEW && resultCode == RESULT_OK) { refreshCourseList(); } } private void startReminderService() { Intent serviceIntent = new Intent(this, CourseReminderService.class); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { startForegroundService(serviceIntent); } else { startService(serviceIntent); } } @Override protected void onResume() { super.onResume(); refreshCourseList();// 每次回到界面时刷新数据 } @Override protected void onDestroy() { dbHelper.close(); super.onDestroy(); } }这是MainActivity的代码
06-09
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值